ExtremeXOS

{{Infobox OS

| name = ExtremeXOS

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| developer = Extreme Networks

| source_model = Closed source and partly Open source

| kernel_type = Monolithic (Linux)

| supported_platforms = Extreme Networks Network switches

| ui = Command-line interface

| family = Unix-like

| released = version 10.1: February, 2004

| latest_release_version = v33.3.1.4

| latest_release_date = 16.04.2025

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| language = English

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| working_state = Current

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| website = {{URL|http://www.extremenetworks.com/products/extreme-xos.aspx}}

}}

ExtremeXOS is the software or the network operating system used in newer Extreme Networks network switches.{{citation | url = http://www.extremenetworks.com/products/extreme-xos.aspx | publisher = Extreme Networks | title = ExtremeXOS Network Operating System}}. It is Extreme Networks second generation operating system after the VxWorks based ExtremeWare operating system.

ExtremeXOS is based on the Linux kernel and BusyBox.{{citation | url = http://www.networkworld.com/newsletters/linux/2004/0503linux2.html | publisher = Network World | title = Extreme Networks puts Linux to work in routing switch | date = 2004-05-03 | access-date = 2009-09-09 | archive-date = 2011-06-15 | archive-url = https://web.archive.org/web/20110615011705/http://www.networkworld.com/newsletters/linux/2004/0503linux2.html | url-status = dead }}. In July 2008 legal action was taken against Extreme Networks due to alleged violation of the GNU General Public License.{{citation | url = https://lwn.net/Articles/291086/ | publisher = Linux Weekly News | title = Today's SFLC/BusyBox target: Extreme Networks, Inc}}. Three months later the lawsuit was settled out of court.{{citation | url = http://www.softwarefreedom.org/news/2008/oct/06/busybox-extreme-settle/ | publisher = Software Freedom Law Center | title = BusyBox Developers Settle Case With Extreme Networks}}.